• Fora person at rest, the blood pressure in the aorta is 120 torr and the velocity of the blood is 25 cm/s. The person then goes for a brisk walk raising the blood velocity to 100 cm/s. Using Bernoulli's equation and assuming the height of the blood remains constant, calculate the blood pressure in the aorta during the brisk walk. Hint: Convert everything to standard units, for example, 1cm = 0.01 m. The standard unit for pressure is Pascal (Pa, although blood pressure is usually reported in torr). 1 torr = 133-32 Pa • (1 Pa = 1 kg. m.s).

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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